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Sweden-Number/libs/wine/loader.c

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/*
* Win32 builtin dlls support
*
* Copyright 2000 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "windef.h"
#include "winbase.h"
#include "wine/library.h"
/* argc/argv for the Windows application */
int __wine_main_argc = 0;
char **__wine_main_argv = NULL;
WCHAR **__wine_main_wargv = NULL;
char **__wine_main_environ = NULL;
#define MAX_DLLS 100
static struct
{
const IMAGE_NT_HEADERS *nt; /* NT header */
const char *filename; /* DLL file name */
} builtin_dlls[MAX_DLLS];
static int nb_dlls;
static const IMAGE_NT_HEADERS *main_exe;
static load_dll_callback_t load_dll_callback;
static const char **dll_paths;
static int nb_dll_paths;
static int dll_path_maxlen;
/* build the dll load path from the WINEDLLPATH variable */
static void build_dll_path(void)
{
static const char * const dlldir = DLLDIR;
int len, count = 0;
char *p, *path = getenv( "WINEDLLPATH" );
if (path)
{
/* count how many path elements we need */
path = strdup(path);
p = path;
while (*p)
{
while (*p == ':') p++;
if (!*p) break;
count++;
while (*p && *p != ':') p++;
}
}
dll_paths = malloc( (count+1) * sizeof(*dll_paths) );
if (count)
{
p = path;
nb_dll_paths = 0;
while (*p)
{
while (*p == ':') *p++ = 0;
if (!*p) break;
dll_paths[nb_dll_paths] = p;
while (*p && *p != ':') p++;
if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
dll_path_maxlen = p - dll_paths[nb_dll_paths];
nb_dll_paths++;
}
}
/* append default dll dir (if not empty) to path */
if ((len = strlen(dlldir)))
{
if (len > dll_path_maxlen) dll_path_maxlen = len;
dll_paths[nb_dll_paths++] = dlldir;
}
}
/* check if a given file can be opened */
inline static int file_exists( const char *name )
{
int fd = open( name, O_RDONLY );
if (fd != -1) close( fd );
return (fd != -1);
}
/* open a library for a given dll, searching in the dll path
* 'name' must be the Windows dll name (e.g. "kernel32.dll") */
static void *dlopen_dll( const char *name, char *error, int errorsize,
int test_only, int *exists )
{
int i, namelen = strlen(name);
char *buffer, *p;
void *ret = NULL;
buffer = malloc( dll_path_maxlen + namelen + 5 );
/* store the name at the end of the buffer, followed by .so */
p = buffer + dll_path_maxlen;
*p++ = '/';
memcpy( p, name, namelen );
strcpy( p + namelen, ".so" );
*exists = 0;
for (i = 0; i < nb_dll_paths; i++)
{
int len = strlen(dll_paths[i]);
p = buffer + dll_path_maxlen - len;
memcpy( p, dll_paths[i], len );
if (!test_only && (ret = wine_dlopen( p, RTLD_NOW, error, errorsize ))) break;
if ((*exists = file_exists( p ))) break; /* exists but cannot be loaded, return the error */
}
free( buffer );
return ret;
}
/* adjust an array of pointers to make them into RVAs */
static inline void fixup_rva_ptrs( void *array, void *base, int count )
{
void **ptr = (void **)array;
while (count--)
{
if (*ptr) *ptr = (void *)((char *)*ptr - (char *)base);
ptr++;
}
}
/* fixup RVAs in the import directory */
static void fixup_imports( IMAGE_IMPORT_DESCRIPTOR *dir, DWORD size, void *base )
{
int count = size / sizeof(void *);
void **ptr = (void **)dir;
/* everything is either a pointer or a ordinal value below 0x10000 */
while (count--)
{
if (*ptr >= (void *)0x10000) *ptr = (void *)((char *)*ptr - (char *)base);
else if (*ptr) *ptr = (void *)(0x80000000 | (unsigned int)*ptr);
ptr++;
}
}
/* fixup RVAs in the resource directory */
static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, char *root, void *base )
{
IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
int i;
entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
{
void *ptr = root + entry->u2.s3.OffsetToDirectory;
if (entry->u2.s3.DataIsDirectory) fixup_resources( ptr, root, base );
else
{
IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
fixup_rva_ptrs( &data->OffsetToData, base, 1 );
}
}
}
/* map a builtin dll in memory and fixup RVAs */
static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
{
#ifdef HAVE_MMAP
IMAGE_DATA_DIRECTORY *dir;
IMAGE_DOS_HEADER *dos;
IMAGE_NT_HEADERS *nt;
IMAGE_SECTION_HEADER *sec;
BYTE *addr;
DWORD code_start, data_start, data_end;
const size_t page_size = getpagesize();
const size_t page_mask = page_size - 1;
int nb_sections = 2; /* code + data */
size_t size = (sizeof(IMAGE_DOS_HEADER)
+ sizeof(IMAGE_NT_HEADERS)
+ nb_sections * sizeof(IMAGE_SECTION_HEADER));
assert( size <= page_size );
/* module address must be aligned on 64K boundary */
addr = (BYTE *)((nt_descr->OptionalHeader.ImageBase + 0xffff) & ~0xffff);
if (wine_anon_mmap( addr, page_size, PROT_READ|PROT_WRITE, MAP_FIXED ) != addr) return NULL;
dos = (IMAGE_DOS_HEADER *)addr;
nt = (IMAGE_NT_HEADERS *)(dos + 1);
sec = (IMAGE_SECTION_HEADER *)(nt + 1);
/* Build the DOS and NT headers */
dos->e_magic = IMAGE_DOS_SIGNATURE;
dos->e_lfanew = sizeof(*dos);
*nt = *nt_descr;
code_start = page_size;
data_start = ((BYTE *)nt->OptionalHeader.BaseOfData - addr) & ~page_mask;
data_end = (((BYTE *)nt->OptionalHeader.SizeOfImage - addr) + page_mask) & ~page_mask;
nt->FileHeader.NumberOfSections = nb_sections;
nt->OptionalHeader.BaseOfCode = code_start;
nt->OptionalHeader.BaseOfData = data_start;
nt->OptionalHeader.SizeOfCode = data_start - code_start;
nt->OptionalHeader.SizeOfInitializedData = data_end - data_start;
nt->OptionalHeader.SizeOfUninitializedData = 0;
nt->OptionalHeader.SizeOfImage = data_end;
nt->OptionalHeader.ImageBase = (DWORD)addr;
fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
/* Build the code section */
strcpy( sec->Name, ".text" );
sec->SizeOfRawData = data_start - code_start;
sec->Misc.VirtualSize = sec->SizeOfRawData;
sec->VirtualAddress = code_start;
sec->PointerToRawData = code_start;
sec->Characteristics = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
sec++;
/* Build the data section */
strcpy( sec->Name, ".data" );
sec->SizeOfRawData = data_end - data_start;
sec->Misc.VirtualSize = sec->SizeOfRawData;
sec->VirtualAddress = data_start;
sec->PointerToRawData = data_start;
sec->Characteristics = (IMAGE_SCN_CNT_INITIALIZED_DATA |
IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
sec++;
/* Build the import directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
if (dir->Size)
{
IMAGE_IMPORT_DESCRIPTOR *imports = (void *)dir->VirtualAddress;
fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
fixup_imports( imports, dir->Size, addr );
}
/* Build the resource directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
if (dir->Size)
{
void *ptr = (void *)dir->VirtualAddress;
fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
fixup_resources( ptr, ptr, addr );
}
/* Build the export directory */
dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
if (dir->Size)
{
IMAGE_EXPORT_DIRECTORY *exports = (void *)dir->VirtualAddress;
fixup_rva_ptrs( &dir->VirtualAddress, addr, 1 );
fixup_rva_ptrs( (void *)exports->AddressOfFunctions, addr, exports->NumberOfFunctions );
fixup_rva_ptrs( (void *)exports->AddressOfNames, addr, exports->NumberOfNames );
fixup_rva_ptrs( &exports->Name, addr, 1 );
fixup_rva_ptrs( &exports->AddressOfFunctions, addr, 1 );
fixup_rva_ptrs( &exports->AddressOfNames, addr, 1 );
fixup_rva_ptrs( &exports->AddressOfNameOrdinals, addr, 1 );
}
return addr;
#else /* HAVE_MMAP */
return NULL;
#endif /* HAVE_MMAP */
}
/***********************************************************************
* __wine_dll_register
*
* Register a built-in DLL descriptor.
*/
void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
{
if (load_dll_callback) load_dll_callback( map_dll(header), filename );
else
{
if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
main_exe = header;
else
{
assert( nb_dlls < MAX_DLLS );
builtin_dlls[nb_dlls].nt = header;
builtin_dlls[nb_dlls].filename = filename;
nb_dlls++;
}
}
}
/***********************************************************************
* wine_dll_set_callback
*
* Set the callback function for dll loading, and call it
* for all dlls that were implicitly loaded already.
*/
void wine_dll_set_callback( load_dll_callback_t load )
{
int i;
load_dll_callback = load;
for (i = 0; i < nb_dlls; i++)
{
const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
if (!nt) continue;
builtin_dlls[i].nt = NULL;
load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
}
nb_dlls = 0;
if (main_exe) load_dll_callback( map_dll(main_exe), "" );
}
/***********************************************************************
* wine_dll_load
*
* Load a builtin dll.
*/
void *wine_dll_load( const char *filename, char *error, int errorsize, int *file_exists )
{
int i;
/* callback must have been set already */
assert( load_dll_callback );
/* check if we have it in the list */
/* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
for (i = 0; i < nb_dlls; i++)
{
if (!builtin_dlls[i].nt) continue;
if (!strcmp( builtin_dlls[i].filename, filename ))
{
const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
builtin_dlls[i].nt = NULL;
load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
*file_exists = 1;
return (void *)1;
}
}
return dlopen_dll( filename, error, errorsize, 0, file_exists );
}
/***********************************************************************
* wine_dll_unload
*
* Unload a builtin dll.
*/
void wine_dll_unload( void *handle )
{
if (handle != (void *)1)
wine_dlclose( handle, NULL, 0 );
}
/***********************************************************************
* wine_dll_load_main_exe
*
* Try to load the .so for the main exe.
*/
void *wine_dll_load_main_exe( const char *name, char *error, int errorsize,
int test_only, int *file_exists )
{
return dlopen_dll( name, error, errorsize, test_only, file_exists );
}
/***********************************************************************
* debug_usage
*/
static void debug_usage(void)
{
static const char usage[] =
"Syntax of the WINEDEBUG variable:\n"
" WINEDEBUG=[class]+xxx,[class]-yyy,...\n\n"
"Example: WINEDEBUG=+all,warn-heap\n"
" turns on all messages except warning heap messages\n"
"Available message classes: err, warn, fixme, trace\n";
write( 2, usage, sizeof(usage) - 1 );
exit(1);
}
/***********************************************************************
* wine_init
*
* Main Wine initialisation.
*/
void wine_init( int argc, char *argv[], char *error, int error_size )
{
extern char **environ;
char *wine_debug;
int file_exists;
void *ntdll;
void (*init_func)(void);
build_dll_path();
wine_init_argv0_path( argv[0] );
__wine_main_argc = argc;
__wine_main_argv = argv;
__wine_main_environ = environ;
if ((wine_debug = getenv("WINEDEBUG")))
{
if (!strcmp( wine_debug, "help" )) debug_usage();
wine_dbg_parse_options( wine_debug );
}
if (!(ntdll = dlopen_dll( "ntdll.dll", error, error_size, 0, &file_exists ))) return;
if (!(init_func = wine_dlsym( ntdll, "__wine_process_init", error, error_size ))) return;
init_func();
}
/*
* These functions provide wrappers around dlopen() and associated
* functions. They work around a bug in glibc 2.1.x where calling
* a dl*() function after a previous dl*() function has failed
* without a dlerror() call between the two will cause a crash.
* They all take a pointer to a buffer that
* will receive the error description (from dlerror()). This
* parameter may be NULL if the error description is not required.
*/
/***********************************************************************
* wine_dlopen
*/
void *wine_dlopen( const char *filename, int flag, char *error, int errorsize )
{
#ifdef HAVE_DLOPEN
void *ret;
const char *s;
dlerror(); dlerror();
ret = dlopen( filename, flag );
s = dlerror();
if (error)
{
strncpy( error, s ? s : "", errorsize );
error[errorsize - 1] = '\0';
}
dlerror();
return ret;
#else
if (error)
{
strncpy( error, "dlopen interface not detected by configure", errorsize );
error[errorsize - 1] = '\0';
}
return NULL;
#endif
}
/***********************************************************************
* wine_dlsym
*/
void *wine_dlsym( void *handle, const char *symbol, char *error, int errorsize )
{
#ifdef HAVE_DLOPEN
void *ret;
const char *s;
dlerror(); dlerror();
ret = dlsym( handle, symbol );
s = dlerror();
if (error)
{
strncpy( error, s ? s : "", errorsize );
error[errorsize - 1] = '\0';
}
dlerror();
return ret;
#else
if (error)
{
strncpy( error, "dlopen interface not detected by configure", errorsize );
error[errorsize - 1] = '\0';
}
return NULL;
#endif
}
/***********************************************************************
* wine_dlclose
*/
int wine_dlclose( void *handle, char *error, int errorsize )
{
#ifdef HAVE_DLOPEN
int ret;
const char *s;
dlerror(); dlerror();
ret = dlclose( handle );
s = dlerror();
if (error)
{
strncpy( error, s ? s : "", errorsize );
error[errorsize - 1] = '\0';
}
dlerror();
return ret;
#else
if (error)
{
strncpy( error, "dlopen interface not detected by configure", errorsize );
error[errorsize - 1] = '\0';
}
return 1;
#endif
}
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